I also have a 06 Rav4. I flushed the ATF through the return line using about 15 qts or so of Maxlife and replaced the screen filter. The WS had been in there for about 105K+. Maxlife works fine. If you have the I4, don't forget to check oil levels until you get an idea of how much it burns. Decent little car otherwise though it breaks traction a bit too easily and often unexpectedly.